Returns IEFT_Unknown if no importer knows this mimetype. Note that more than one importer may support a mimetype. We return the first one we find. This function should closely resemble IE_Exp::fileTypeForSuffix()

Returns IEFT_Unknown if no importer knows this suffix. Note that more than one importer may support a suffix. We return the first one we find. This function should closely resemble IE_Exp::fileTypeForSuffix()